What are the potential pitfalls of using strtoupper() to convert strings to uppercase in PHP?

Using strtoupper() to convert strings to uppercase in PHP can potentially cause issues with non-ASCII characters, as it may not handle them correctly. To avoid this problem, it is recommended to use mb_strtoupper() instead, which is multibyte safe and can handle different character encodings. 

$string = "Hello, world!";
$uppercaseString = mb_strtoupper($string);
echo $uppercaseString;

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strtoupper strings conversion PHP pitfalls

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